mike-wsm
Fascinating design, though puzzling if you ask me. Firstly the inlet that it has seems to have a tiny throat with what must be enormous duct pressures, I don't know why you'd have so much air go through the porous part of the duct into the pre-cooler (though I understand why you'd have the air from the inlet going through). The pre-cooler looks smaller than the SABRE and Scimitar's though (though this could be an optical illusion).
Why do you have the air going through the pre-cooler from the sides and in a spiral-trajectory rather than just straight through? I don't really get it.
BTW: In the link about SABRE/Skylon and Scimitar/LAPCAT A2 -- there's a mathematica formula listed: T = 220 (1 + 0.2M^2N)
I don't really know what this formula is or what units the 220 is in (I assume Kelvin though I'm not sure); I don't really understand what the function of the N is. It looks almost like an exponent, but it's a subscript instead of a superscript. I don't know that math function.